Two additional incidents occurred in Washington, D.C. and in western Pennsylvania. In Washington, terrorists used a third plane to assault the Pentagon at 9:45 a.m. In Pennsylvania, hijackers commandeered a fourth plane, but, thanks to a valiant effort from several passengers and crew members, the aircraft crash landed into a field instead of another significant target.
By nightfall, both World Trade Center buildings had collapsed, the Pentagon suffered significant damage and the United States was shaken. Over 3,000 Americans perished during the September 11 attacks, including all individuals on board the aircraft, thousands at the World Trade Center and dozens at the Pentagon. President George W. Bush addressed the nation with a powerful message that reassured the resolve of the American spirit and promised swift justice for those involved.